Texas Instruments 28xxx - 4.6 Trip-Zone Submodule Control and Status Registers

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4.6 Trip-Zone Submodule Control and Status Registers
Trip-Zone Submodule Control and Status Registers
Table 4-16. PWM-Chopper Control Register (PCCTL) Bit Descriptions (continued)
Bits Name Value Description
10-8 CHPDUTY Chopping Clock Duty Cycle
000 Duty = 1/8 (12.5%)
001 Duty = 2/8 (25.0%)
010 Duty = 3/8 (37.5%)
011 Duty = 4/8 (50.0%)
100 Duty = 5/8 (62.5%)
101 Duty = 6/8 (75.0%)
110 Duty = 7/8 (87.5%)
111 Reserved
7:5 CHPFREQ Chopping Clock Frequency
000 Divide by 1 (no prescale, = 12.5 MHz at 100 MHz SYSCLKOUT)
001 Divide by 2 (6.25 MHz at 100 MHz SYSCLKOUT)
010 Divide by 3 (4.16 MHz at 100 MHz SYSCLKOUT)
011 Divide by 4 (3.12 MHz at 100 MHz SYSCLKOUT)
100 Divide by 5 (2.50 MHz at 100 MHz SYSCLKOUT)
101 Divide by 6 (2.08 MHz at 100 MHz SYSCLKOUT)
110 Divide by 7 (1.78 MHz at 100 MHz SYSCLKOUT)
111 Divide by 8 (1.56 MHz at 100 MHz SYSCLKOUT)
4:1 OSHTWTH One-Shot Pulse Width
0000 1 x SYSCLKOUT / 8 wide ( = 80 nS at 100 MHz SYSCLKOUT)
0001 2 x SYSCLKOUT / 8 wide ( = 160 nS at 100 MHz SYSCLKOUT)
0010 3 x SYSCLKOUT / 8 wide ( = 240 nS at 100 MHz SYSCLKOUT)
0011 4 x SYSCLKOUT / 8 wide ( = 320 nS at 100 MHz SYSCLKOUT)
0100 5 x SYSCLKOUT / 8 wide ( = 400 nS at 100 MHz SYSCLKOUT)
0101 6 x SYSCLKOUT / 8 wide ( = 480 nS at 100 MHz SYSCLKOUT)
0110 7 x SYSCLKOUT / 8 wide ( = 560 nS at 100 MHz SYSCLKOUT)
0111 8 x SYSCLKOUT / 8 wide ( = 640 nS at 100 MHz SYSCLKOUT)
1000 9 x SYSCLKOUT / 8 wide ( = 720 nS at 100 MHz SYSCLKOUT)
1001 10 x SYSCLKOUT / 8 wide ( = 800 nS at 100 MHz SYSCLKOUT)
1010 11 x SYSCLKOUT / 8 wide ( = 880 nS at 100 MHz SYSCLKOUT)
1011 12 x SYSCLKOUT / 8 wide ( = 960 nS at 100 MHz SYSCLKOUT)
1100 13 x SYSCLKOUT / 8 wide ( = 1040 nS at 100 MHz SYSCLKOUT)
1101 14 x SYSCLKOUT / 8 wide ( = 1120 nS at 100 MHz SYSCLKOUT)
1110 15 x SYSCLKOUT / 8 wide ( = 1200 nS at 100 MHz SYSCLKOUT)
1111 16 x SYSCLKOUT / 8 wide ( = 1280 nS at 100 MHz SYSCLKOUT)
0 CHPEN PWM-chopping Enable
0 Disable (bypass) PWM chopping function
1 Enable chopping function
Figure 4-17 and Table 4-17 provide the trip-zone control and status register definitions.
106 Registers SPRU791D – November 2004 – Revised October 2007
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